期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 55, 期 33, 页码 9783-9787出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201603789
关键词
C-H functionalization; metal-free catalysts; photocatalysis; small-molecule organic semiconductor; visible light
资金
- Max Planck Society
- China Scholarship Council (CSC)
Herein, we report on the structural design principle of small-molecule organic semiconductors as metal-free, pure organic and visible light-active photocatalysts. Two series of electron-donor and acceptor-type organic semiconductor molecules were synthesized to meet crucial requirements, such as 1) absorption range in the visible region, 2) sufficient photoredox potential, and 3) long lifetime of photogenerated excitons. The photocatalytic activity was demonstrated in the intermolecular C-H functionalization of electron-rich heteroaromates with malonate derivatives. A mechanistic study of the light-induced electron transport between the organic photocatalyst, substrate, and the sacrificial agent are described. With their tunable absorption range and defined energy-band structure, the small-molecule organic semiconductors could offer a new class of metal-free and visible light-active photocatalysts for chemical reactions.
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